diff --git a/bench.js b/bench.js
index 5268c3f..66e7c73 100644
--- a/bench.js
+++ b/bench.js
@@ -1,5 +1,5 @@
 
-var flatbush = require('./index.js').default;
+var Flatbush = require('./index.js').default;
 var rbush = require('rbush');
 
 var N = 1000000;
@@ -28,7 +28,7 @@ for (i = 0; i < K; i++) {
 }
 
 console.time('flatbush');
-var index = flatbush(N, 16);
+var index = new Flatbush(N, 16);
 for (i = 0; i < coords.length; i += 4) {
     index.add(
         coords[i],
diff --git a/index.js b/index.js
index 492aa83..3ec7a18 100644
--- a/index.js
+++ b/index.js
@@ -1,9 +1,5 @@
 
-export default function flatbush(numItems, nodeSize, ArrayType, data) {
-    return new Flatbush(numItems, nodeSize, ArrayType, data);
-}
-
-function Flatbush(numItems, nodeSize, ArrayType, data) {
+export default function Flatbush(numItems, nodeSize, ArrayType, data) {
     if (numItems === undefined) throw new Error('Missing required argument: numItems.');
 
     this.numItems = numItems;
diff --git a/package.json b/package.json
index 54345f2..105e4da 100644
--- a/package.json
+++ b/package.json
@@ -10,7 +10,7 @@
     "pretest": "eslint index.js test.js bench.js",
     "test": "node -r @std/esm test.js",
     "bench": "node -r @std/esm bench.js",
-    "build": "rollup index.js --o flatbush.js -f umd --name flatbush && uglifyjs flatbush.js -c -m -o flatbush.min.js",
+    "build": "rollup index.js --o flatbush.js -f umd --name Flatbush && uglifyjs flatbush.js -c -m -o flatbush.min.js",
     "prepare": "npm run build"
   },
   "files": [
diff --git a/test.js b/test.js
index 8dfd27c..ee0d36c 100644
--- a/test.js
+++ b/test.js
@@ -1,5 +1,5 @@
 
-var flatbush = require('./index.js').default;
+var Flatbush = require('./index.js').default;
 var test = require('tape').test;
 
 var data = [
@@ -23,7 +23,7 @@ var data = [
 ];
 
 function createIndex() {
-    var index = flatbush(data.length / 4);
+    var index = new Flatbush(data.length / 4);
 
     for (var i = 0; i < data.length; i += 4) {
         index.add(data[i], data[i + 1], data[i + 2], data[i + 3]);
@@ -64,7 +64,7 @@ test('performs bbox search', function (t) {
 
 test('reconstructs an index from array buffer', function (t) {
     var index = createIndex();
-    var index2 = flatbush(data.length / 4, 16, Float64Array, index.data.buffer);
+    var index2 = new Flatbush(data.length / 4, 16, Float64Array, index.data.buffer);
 
     t.same(index, index2);
     t.end();